That's not how statistical probability works. Just cause its possible doesn't mean it's garaunteed. Out of 50 pulls I got 2 legendaries and like 9 epics.
You got a ~6% pull rate. What you dont take into account is if you pulled another 53 pulls you may have gotten a number of epics that would get you to 16%, or even more.
I did 30 ancients and got 1 leggo, 6 epics (quality varied)....but on my very LAST shard attempt i pulled a Geomancer. Still pretty new as im at about 35 days total of playing...but after reading some posts on the forums I suppose i really lucked out on my last shard
Congrats on winning the Geo lottery :D